Question

A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of KI. When a solution of barium chloride is added to a solution of powder, a white precipitate results. This white powder may be ______.

विकल्प

• a soluble sulphate

• KBr or NaBr

• Ba(NO₃)₂

• AgNO₃

Answer 1

A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of KI. When a solution of barium chloride is added to a solution of powder, a white precipitate results. This white powder may be AgNO₃.

Explanation:

\[\ce{2AgNO3 -> Ag2O + \underset{Browngas}{2NO2 ^} + 1/2O2}\]

\[\ce{AgNO3 + KI -> \underset{yellow}{AgI↓} + KNO3}\]